None.
A square inch or air is a measure of area. It has no height at all and so, the volume is zero. A volume of zero cannot contain any particles.
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On earth it is responsible for air pressure. There are about 15 pounds of air above every square inch of the earth's surface. Or in other words, the volume of a column of air on Earth about a hundred miles high and a square inch in area weighs 15 pounds.
It is mostly used when referring to air. I suppose it can be used but I would expect it to be inches cubed instead of per square inch when dealing with water.
Air return duct and filter grille size is dictated by the size of the unit (CFM) not the size of the house.
1500 sq ft.
The answer depends on the pressure inside the balloons.